The recommended layout and routing for the crystal oscillator circuit can be found in the Maxim Integrated Products application note 3581, 'Crystal Oscillator Circuits'. It is essential to follow the recommended layout and routing guidelines to ensure the oscillator starts reliably and operates within the specified frequency range.
To ensure the RTC maintains accuracy over temperature, it is essential to use a high-quality crystal oscillator with a low temperature coefficient, such as a crystal with a ±10 ppm/°C temperature coefficient. Additionally, the DS1388Z-5 has a built-in temperature compensation circuit that can be enabled to improve accuracy over temperature.
The maximum capacitance value for the crystal oscillator circuit is 22 pF. Exceeding this value may prevent the oscillator from starting or affect its reliability.
While it is technically possible to use a battery with a different chemistry, it is not recommended. The DS1388Z-5 is designed to work with silver-oxide batteries, and using a different chemistry may affect the battery life, accuracy, and overall performance of the RTC.
The DS1388Z-5 has a built-in battery switchover circuit that automatically switches to the battery supply during power failure. However, it is essential to ensure that the battery is properly connected and the VBAT pin is properly decoupled to prevent noise and voltage spikes from affecting the RTC operation.
DS1388Z-5 datasheet
by Maxim Integrated Products
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